How to use

signatureToKey

method

in

io.yggdrash.common.crypto.ECKey

@Test(expected = SignatureException.class)
public void testInvalidSignatureLength() throws SignatureException {
  // Expecting a SignatureException for invalid signature length
  byte[] messageHash = new byte[32];
  ECKey.signatureToKey(messageHash, "abcdefg");
}

public static byte[] calculatePubKey(byte[] data, byte[] signature, boolean hashed) {
  ECKey.ECDSASignature ecdsaSignature = new ECKey.ECDSASignature(signature);
  byte[] hashedData = hashed ? data : HashUtil.sha3(data);
  ECKey ecKeyPub;
  try {
    ecKeyPub = ECKey.signatureToKey(hashedData, ecdsaSignature);
  } catch (SignatureException e) {
    logger.debug("Invalid signature" + e.getMessage());
    return null;
  }
  return ecKeyPub.getPubKey();
}

/**
 * Get the public key.
 *
 * @return public key
 */
byte[] getPubKey() throws SignatureException {
  ECKey.ECDSASignature ecdsaSignature = new ECKey.ECDSASignature(this.signature);
  ECKey ecKeyPub = ECKey.signatureToKey(this.header.getHashForSigning(), ecdsaSignature);
  return ecKeyPub.getPubKey();
}

@Test(expected = SignatureException.class)
public void testBadBase64Sig() throws SignatureException {
  // Expecting a SignatureException for invalid Base64
  byte[] messageHash = new byte[32];
  ECKey.signatureToKey(messageHash, "This is not valid Base64!");
}

public byte[] getPubKey() {
  ECKey.ECDSASignature ecdsaSignature = new ECKey.ECDSASignature(this.signature);
  ECKey ecKeyPub = null;
  try {
    ecKeyPub = ECKey.signatureToKey(this.header.getHashForSigning(), ecdsaSignature);
  } catch (SignatureException e) {
    log.warn(e.getMessage());
    throw new InvalidSignatureException();
  }
  return ecKeyPub.getPubKey();
}

/**
 * Verify the signature with public key
 *
 * @param data signed data
 * @param signature  signature
 * @param hashed whether hashed data or not
 * @param pubKey public key for verifying
 * @return verification result
 */
public static boolean verify(byte[] data, byte[] signature, boolean hashed, byte[] pubKey) {
  ECKey.ECDSASignature ecdsaSignature = new ECKey.ECDSASignature(signature);
  byte[] hashedData = hashed ? data : HashUtil.sha3(data);
  ECKey ecKeyPub;
  try {
    ecKeyPub = ECKey.signatureToKey(hashedData, ecdsaSignature);
  } catch (SignatureException e) {
    logger.debug("Invalid signature" + e.getMessage());
    return false;
  }
  if (pubKey != null && !Arrays.equals(ecKeyPub.getPubKey(), pubKey)) {
    logger.debug("Invalid signature");
    return false;
  }
  return ecKeyPub.verify(hashedData, ecdsaSignature);
}

public boolean verify() {
  if (!this.verifyData()) {
    return false;
  }
  ECKey.ECDSASignature ecdsaSignature = new ECKey.ECDSASignature(this.signature);
  byte[] hashedHeader = this.header.getHashForSigning();
  ECKey ecKeyPub;
  try {
    ecKeyPub = ECKey.signatureToKey(hashedHeader, ecdsaSignature);
  } catch (SignatureException e) {
    throw new InvalidSignatureException(e);
  }
  return ecKeyPub.verify(hashedHeader, ecdsaSignature);
}

@Test // result is a point at infinity
public void testVerifySignature4() throws SignatureException {
  byte[] hash = Hex.decode("6ee854b88dbf19846c58fd2beac582adcf28cfdd2b3a8427ac29d7b70153d35c");
  BigInteger r = new BigInteger("95350169487015575001444507567851457309689354890536757640816472151471942911739");
  BigInteger s = new BigInteger("53263359985948886716508128220321578640585687230908938312863706887350789467339");
  ECDSASignature sig = ECDSASignature.fromComponents(r.toByteArray(), s.toByteArray(), (byte) 28);
  ECKey key = ECKey.signatureToKey(hash, sig);
  assertTrue(key.verify(hash, sig));
}

/**
 * Verify a transaction.(data format & signing)
 *
 * @return true(success), false(fail)
 */
public boolean verify() {
  if (!this.verifyData()) {
    return false;
  }
  ECKey.ECDSASignature ecdsaSignature = new ECKey.ECDSASignature(this.signature);
  byte[] hashedHeader = this.header.getHashForSigning();
  ECKey ecKeyPub;
  try {
    ecKeyPub = ECKey.signatureToKey(hashedHeader, ecdsaSignature);
  } catch (SignatureException e) {
    throw new InvalidSignatureException(e);
  }
  return ecKeyPub.verify(hashedHeader, ecdsaSignature);
}

@Test
public void testSignedMessageToKey() throws SignatureException {
  byte[] messageHash = HashUtil.sha3(exampleMessage.getBytes());
  ECKey key = ECKey.signatureToKey(messageHash, sigBase64);
  assertNotNull(key);
  assertArrayEquals(pubKey, key.getPubKey());
}

public boolean verify() {
  ECKey.ECDSASignature ecdsaSignature = new ECKey.ECDSASignature(signature.getBytes());
  try {
    ECKey ecKeyPub = ECKey.signatureToKey(rawForSign.getBytes(), ecdsaSignature);
    if (ecKeyPub.verify(rawForSign.getBytes(), ecdsaSignature)) {
      return new Address(ecKeyPub.getAddress()).equals(owner);
    } else {
      return false;
    }
  } catch (SignatureException e) {
    throw new InvalidSignatureException(e);
  }
}

@Test
public void testVerifySignature_Static() throws SignatureException {
  byte[] messageHash = Hex.decode("92e0d4290bba01aa0abbb4705360c751af13fdb1131b8f6f1e632c4621adac75");
  byte[] signature = Hex.decode("1cca588a8eb84d5bf6741bc6e0ccfbe1fdb05b6c624b5fe72199fa1f2e501f876c5b5f11863323a998b79a0d27714fcc8825cf357903e863396f2e2e281220de31");
  // get public key with messageHash, ECDSASignature
  ECKey.ECDSASignature sig = new ECKey.ECDSASignature(signature);
  ECKey keyFromSig = ECKey.signatureToKey(messageHash, sig);
  log.debug("address=" + Hex.toHexString(keyFromSig.getAddress()));
  byte[] pubKeyFromSig = keyFromSig.getPubKey();
  log.debug("pubKey=" + Hex.toHexString(pubKeyFromSig));
  assertArrayEquals(pubKeyFromSig, Hex.decode("0493fe448d38c77c212cce10c07ed37984c59bedac51219b70847429153063cfae0d2f42ba394ffe9d5d2d11b0c0f400ac04997c584c0ef6f2041cf20f8c2c446b"));
  // verify the sign message
  assertTrue(keyFromSig.verify(messageHash, sig));
}

@Test
public void testVerifySignature2() throws SignatureException {
  BigInteger r = new BigInteger("c52c114d4f5a3ba904a9b3036e5e118fe0dbb987fe3955da20f2cd8f6c21ab9c", 16);
  BigInteger s = new BigInteger("6ba4c2874299a55ad947dbc98a25ee895aabf6b625c26c435e84bfd70edf2f69", 16);
  ECDSASignature sig = ECDSASignature.fromComponents(r.toByteArray(), s.toByteArray(), (byte) 0x1b);
  byte[] rawtx = Hex.decode("f82804881bc16d674ec8000094cd2a3d9f938e13cd947ec05abc7fe734df8dd8268609184e72a0006480");
  byte[] rawHash = HashUtil.sha3(rawtx);
  byte[] address = Hex.decode("cd2a3d9f938e13cd947ec05abc7fe734df8dd826");
  ECKey key = ECKey.signatureToKey(rawHash, sig);
  assertEquals(key, ECKey.signatureToKey(rawHash, sig.toBase64()));
  assertEquals(key, ECKey.recoverFromSignature(0, sig, rawHash));
  assertArrayEquals(key.getPubKey(), ECKey.recoverPubBytesFromSignature(0, sig, rawHash));
  assertArrayEquals(address, key.getAddress());
  assertArrayEquals(address, ECKey.signatureToAddress(rawHash, sig));
  assertArrayEquals(address, ECKey.signatureToAddress(rawHash, sig.toBase64()));
  assertArrayEquals(address, ECKey.recoverAddressFromSignature(0, sig, rawHash));
  assertTrue(key.verify(rawHash, sig));
}

@Test
public void testGetAddressWithSig()
    throws IOException, InvalidCipherTextException, SignatureException {
  Account account = new Account();
  log.debug("Account: " + account.toString());
  log.debug("Account.address: " + Hex.toHexString(account.getAddress()));
  log.debug("Account.pubKey: " + Hex.toHexString(account.getKey().getPubKey()));
  Wallet wallet = new Wallet(account.getKey(), "tmp/path", "nodePri.key", "Aa1234567890!");
  log.debug("Wallet: " + wallet.toString());
  log.debug("Wallet.address: " + Hex.toHexString(wallet.getAddress()));
  log.debug("Wallet.pubKey: " + Hex.toHexString(wallet.getPubicKey()));
  TransactionHusk txHusk1 = createTx(wallet);
  log.debug("Test Transaction1: " + txHusk1.toString());
  log.debug("Test Transaction1 Address: " + txHusk1.getAddress());
  assertThat(txHusk1.verify()).isTrue();
  assertThat(wallet.getAddress()).isEqualTo(account.getAddress());
  assertThat(wallet.getAddress()).isEqualTo(txHusk1.getAddress().getBytes());
  byte[] hashedRawData = txHusk1.getHashForSigning().getBytes();
  log.debug("hashedRawData: " + Hex.toHexString(hashedRawData));
  byte[] signatureBin = txHusk1.getInstance().getSignature().toByteArray();
  log.debug("signatureBin: " + Hex.toHexString(signatureBin));
  ECKey.ECDSASignature ecdsaSignature = new ECKey.ECDSASignature(signatureBin);
  ECKey key = ECKey.signatureToKey(hashedRawData, ecdsaSignature);
  byte[] address = key.getAddress();
  byte[] pubKey = key.getPubKey();
  log.debug("address: " + Hex.toHexString(address));
  log.debug("pubKey: " + Hex.toHexString(pubKey));
  assertThat(account.getAddress()).isEqualTo(address);
  assertThat(account.getKey().getPubKey()).isEqualTo(pubKey);
}

@Test
public void testVerifySignature6() throws SignatureException {
  // generate ECkey object with privateKey
  ECKey key = ECKey.fromPrivate(privateKey);
  // check public key with pubKey
  assertArrayEquals(pubKey, key.getPubKey());
  // generate messageHash with exampleMessage
  byte[] messageHash = HashUtil.sha3(exampleMessage.getBytes());
  // generate ECDSASignature with ECKey, messageHash
  ECDSASignature signature = key.sign(messageHash);
  // verify the sign message
  assertTrue(key.verify(messageHash, signature));
  // get public key with messageHash, ECDSASignature
  ECKey keyFromSig = ECKey.signatureToKey(messageHash, signature);
  byte[] pubKeyFromSig = keyFromSig.getPubKey();
  assertArrayEquals(pubKey, pubKeyFromSig);
  // verify the sign message
  assertTrue(keyFromSig.verify(messageHash, signature));
}